Coming off a clutch performance, Posey looks to continue his success against the Dodgers at AT&T Park on Saturday night and lead the Giants to their longest winning streak of the season.

Posey enjoyed a breakthrough season in 2012, batting a league-best .336 with 24 homers and 103 RBIs -- all career highs.

So far, he's struggling to replicate those impressive numbers, hitting .281 with four homers and 17 RBIs. However, facing the Dodgers at home may be triggering a change.

Posey has a .333 average in 22 home meetings with Los Angeles -- .408 over the past 14.

The All-Star catcher came up big in the opener of this three-game series Friday, connecting for a walkoff homer to clinch a 2-1 win. He also knocked in San Francisco's other run on a sixth-inning double, as the Giants (17-12) matched their season-high four-game winning streak.

"He's the guy you want up there. He ran a deep count there," manager Bruce Bochy said of Posey's homer. "It doesn't come at a better time than when he hit it. That's another great comeback for us."

Scheduled starter Ryan Vogelsong (1-2, 6.23) will try to rebound from his shortest -- and perhaps worst -- start of the season. It was also the most recent defeat for the Giants, 6-4 at San Diego on Sunday.

Vogelsong was battered for six runs and eight hits, including a career high-tying three homers, with three walks in five innings. He's surrendered seven homers over his last four starts.

"I'm just off, man. I can't get anything really going," Vogelsong told the team's official website. "I don't feel like I'm as far off as I was last year."

Last year, the right-hander went 0-2 with a 3.42 ERA over his first four starts before going 6-0 and compiling a 1.76 ERA over his next eight.

Coincidentally, that run started with a 2-1 win over the Dodgers (13-15) on May 8, when he yielded one run in 7 1/3 innings.

Vogelsong is 4-2 with a 1.80 ERA over his last seven starts versus Los Angeles.

Injuries continue to mount for the Dodgers, who lost Hanley Ramirez to a left hamstring injury Friday. The shortstop returned Monday from a torn ligament in his right thumb, which kept him out of the lineup for the first 25 games.

"It sounds like he got it pretty good," manager Don Mattingly said. "It's usually a pretty good amount of time. It's not like he's going to be back in a couple days."

Adrian Gonzalez's status is unclear after he was a late scratch for the series opener due to neck pain, stemming from a collision with an umpire earlier this week.

The injury issues have given Matt Magill an opportunity to showcase himself, and this time it's for Ted Lilly -- placed on the DL Friday with a strain in his right rib cage.

Magill made his major league debut last Saturday because Stephen Fife went on the DL with bursitis in his right shoulder. The right-hander impressed, yielding two runs and four hits with seven strikeouts in 6 2/3 innings while not getting a decision in a 6-4 loss to Milwaukee.

"He's a guy that just seems to be under control," Mattingly told the team's official website. "He's a guy that you can just see his precision really in his work. He's been a guy that has to locate. He's kind of constantly getting better."